CO adsorption on Ce-Pt(111) studied with LEED, XPS, and temperature programmed desorption
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Physics Department, Norwegian University of Science and Technology, N-7491 Trondheim (Norway)
CO adsorption on Ce-Pt(111) has been studied by temperature programmed desorption (TPD), low energy electron diffraction (LEED) and x-ray photoelectron spectroscopy (XPS). Thin layers (1 to 3 ML) of Ce on Pt(111) form upon annealing to 1000 K a surface alloy which most likely is Pt terminated. The CO overlayer structure on Ce-Pt(111) at saturation coverage is argued to be an intermediate between (2x2) and c(4x2) superstructures. This intermediate structure exhibits a c(4x2) LEED pattern in which some of the spots appear together as ordered triangles. The thermal desorption spectra for the Ce-Pt(111) surface alloy are shifted down by a temperature of about 120 K compared to the CO desorption of pure Pt(111), most likely due to a change in the d-band due to hybridization between Ce and Pt states, which results in a weakening of the resonant interaction between CO 5{sigma} and Pt 5d states.
- OSTI ID:
- 20787838
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 3 Vol. 73; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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